用戶端加密

用戶端加密（英語：Client-side encryption）是一門密碼學加密技術，指的是先將數據於傳送端進行加密，然後才傳送到像網路硬碟般的伺服端^[1]。此舉使得只有傳送者擁有金鑰，繼令服務提供者難以將數據解密。應用了用戶端加密的應用程式隱私性相對較強，即使是服務提供者也不能直接得知被加密的內容^[1]。該些應用程式有時會以「零知識」這一誤導性用語作宣傳^[2]。

解說

用戶端加密旨在使服務提供者（或強迫其交出數據的第三方）難以窺探使用者上傳的數據，保證儲存在雲端上的檔案只能於相應用戶端上檢視。這樣可以防止資料遺失，以及檔案在未經授權的情況下洩露給第三方，令使用者更為安心^[1]。

目前的學術研究及IT專業人士皆建議，開發者應在應用程式上加入用戶端加密功能，以保障資訊的機密性及完整性^[3]^[4]^[5]。

提供了用戶端加密的雲端儲存服務有Tresorit（英語：Tresorit）^[6]、MEGA^[7]、SpiderOak（英語：SpiderOak）^[8]。截至2016年2月，ICloud^[1]^[9]、 Google Drive^[10]、Dropbox^[11]皆不支援用戶端加密。

參見

同態加密

參考資料

^ ^1.0 ^1.1 ^1.2 ^1.3 Tunio Gaffer. Why Client-Side Encryption Is the Next Best Idea in Cloud-Based Data Security. Information Security Today. Auerbach Publications. 2015 [2016-02-21]. （原始內容存檔於2016-01-16）.
^ Spider Oak - Please stop describing your service as "Zero Knowledge" unless and ... | Hacker News. news.ycombinator.com. [2018-07-16]. （原始內容存檔於2018-07-16）.
^ Deka, Ganesh Chandra. 3 Security Architecture for Cloud Computing. Handbook of Research on Securing Cloud-Based Databases with Biometric Applications. IGI Global. 2014-10-31 [2016-02-21]. ISBN 978-1-4666-6560-6. （原始內容存檔於2020-07-18）.
^ Tobias Ackermann. IT Security Risk Management: Perceived IT Security Risks in the Context of Cloud Computing. Springer Science & Business Media. 2012-12-22: 136– [2016-02-21]. ISBN 978-3-658-01115-4. （原始內容存檔於2020-07-20）.
^ Communications of the Association for Information Systems 13:Article 24. Cloud Computing Sicherheit: Schutzziele, Taxonomie, Marktübersicht. Fraunhofer-Institut für Sichere Informationstechnologie SIT. 2009 [2016-02-21]. ISBN 978-3-9813317-0-7. （原始內容存檔於2020-08-06）.
^ Get 50GB of Free, Encrypted Online Storage from Tresorit. lifehacker. 2013-11-04 [2020-07-11]. （原始內容存檔於2018-05-10）.
^ Graeber, Charles. Megaupload Is Dead. Long Live Mega! | Threat Level. Wired.com. 2013-03-28 [2013-06-14]. （原始內容存檔於2013-06-25）.
^ SpiderOak: Dropbox for the security obsessive. [2020-07-11]. （原始內容存檔於2016-10-01）. The chief difference between SpiderOak and its competitors for the security and privacy-conscious is in how the services treat user data.
^ Tunio Zaffer. Client Side Encryption: The Latest Trend In Cloud Storage. Dataconomy. 2015-04-08 [2016-02-21]. （原始內容存檔於2016-03-02）.
^ Tom McNamara. How to make Google Drive more secure: Get file encryption and strong password protection to secure your stuff.. CNET’s The Download Blog. 2015-07-08 [2016-02-21]. （原始內容存檔於2016-03-09）.
^ Can I specify my own private key for my Dropbox?. [2016-02-21]. （原始內容存檔於2016-03-03）.

[infosectoday-1] 1.0 ^1.1 ^1.2 ^1.3 Tunio Gaffer. Why Client-Side Encryption Is the Next Best Idea in Cloud-Based Data Security. Information Security Today. Auerbach Publications. 2015 [2016-02-21]. （原始內容存檔於2016-01-16）.

[2] Spider Oak - Please stop describing your service as "Zero Knowledge" unless and ... | Hacker News. news.ycombinator.com. [2018-07-16]. （原始內容存檔於2018-07-16）.

[Chandra2014-3] Deka, Ganesh Chandra. 3 Security Architecture for Cloud Computing. Handbook of Research on Securing Cloud-Based Databases with Biometric Applications. IGI Global. 2014-10-31 [2016-02-21]. ISBN 978-1-4666-6560-6. （原始內容存檔於2020-07-18）.

[Ackermann2012-4] Tobias Ackermann. IT Security Risk Management: Perceived IT Security Risks in the Context of Cloud Computing. Springer Science & Business Media. 2012-12-22: 136– [2016-02-21]. ISBN 978-3-658-01115-4. （原始內容存檔於2020-07-20）.

[5] Communications of the Association for Information Systems 13:Article 24. Cloud Computing Sicherheit: Schutzziele, Taxonomie, Marktübersicht. Fraunhofer-Institut für Sichere Informationstechnologie SIT. 2009 [2016-02-21]. ISBN 978-3-9813317-0-7. （原始內容存檔於2020-08-06）.

[6] Get 50GB of Free, Encrypted Online Storage from Tresorit. lifehacker. 2013-11-04 [2020-07-11]. （原始內容存檔於2018-05-10）.

[7] Graeber, Charles. Megaupload Is Dead. Long Live Mega! | Threat Level. Wired.com. 2013-03-28 [2013-06-14]. （原始內容存檔於2013-06-25）.

[8] SpiderOak: Dropbox for the security obsessive. [2020-07-11]. （原始內容存檔於2016-10-01）. The chief difference between SpiderOak and its competitors for the security and privacy-conscious is in how the services treat user data.

[dataconomy-9] Tunio Zaffer. Client Side Encryption: The Latest Trend In Cloud Storage. Dataconomy. 2015-04-08 [2016-02-21]. （原始內容存檔於2016-03-02）.

[googledriveinsecure-10] Tom McNamara. How to make Google Drive more secure: Get file encryption and strong password protection to secure your stuff.. CNET’s The Download Blog. 2015-07-08 [2016-02-21]. （原始內容存檔於2016-03-09）.

[dropboxnoprivatekey-11] Can I specify my own private key for my Dropbox?. [2016-02-21]. （原始內容存檔於2016-03-03）.

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